如何通过更改文件名来覆盖文件?

Question

我有something.txt和nothing.txt。如何将nothing.txt的名称改为something.txt，同时去掉原来的something.txt?

Answer 1

可以检查文件是否存在。如果有，先把它去掉。

from os import path, rename, remove

def mv(source, destination, overwrite=True):
if path.isfile(destination):
if overwrite:
remove(destination)
else:
raise IOError("Destination file already exist")
rename(source, destination)

Answer 2

使用pathlib更容易。它只是.rename

from pathlib import Path
Path('nothing.txt').rename('something.txt')

演示脚本

from pathlib import Path
# create file and populate with text for demo
with Path('something.txt').open('w') as f:
f.write('something old!')
# check contents
print(Path('something.txt').open('r').readline())

nothing =  Path('nothing.txt')
with nothing.open('w') as f:
f.write('something new!')

# rename replaces the old something with new
nothing.rename('something.txt')
# check results
print(Path('something.txt').open('r').readline())